I really liked the story and the way the romance slowly developed. The last few episodes were really the only drawback. I get she wanted him to follow his dreams too. What makes little sense is the leaving him at the airport and separating from him in such a confusing and silly way. I get they are young and many chinese dramas make a big thing about sacrificing for the ones you love, but it was unnecessary in this story. The big sacrifice would really only need to be dating long distance for two years. Instead she gives a speech about dreams, gives him back the ring, doesn't break things off, but sneaks away at the airport taking his ticket and boarding pass. A talk saying "hey it's only two years, we can facetime and visit each other while we both do what we need to, then talk about getting married when we've finished" would have sufficed. Finish off with some scenes showing them talking on the phone or him visiting her in japan, then wedding in two years, etc. That would makr the most sense based on the characters actions and behaviors throughout the drama, not this weird and ambiguous ending.